Trojan.DownLoader12.31795

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe,'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'AcIcUcAM.exe' = '%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'jaQEcQMQ.exe' = '%HOMEPATH%\NIMMEwsg\jaQEcQMQ.exe'

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\FkYQcQph] 'Start' = '00000002'

Malicious functions:

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files
file extensions

blocks the following features:

User Account Control (UAC)

Creates and executes the following:

'%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe'
'%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe'
'%HOMEPATH%\NIMMEwsg\jaQEcQMQ.exe'

Executes the following:

'<SYSTEM32>\cmd.exe' /c ""%TEMP%\IqoskUEY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\PaQIokYo.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\cegYMoso.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\NEIcgwQc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\EMAQIAIc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\iYsAYskU.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\rkcQQUQA.bat" "<Full path to virus>""
'<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v Hidden /t REG_DWORD /d 2
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v HideFileExt /t REG_DWORD /d 1
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\lowIIswg.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\wyswwEQs.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\oqYc.ico
<Current directory>\gcMO.exe
C:\RCX15.tmp
C:\RCX14.tmp
C:\RCX13.tmp
<Current directory>\SKsA.ico
<Current directory>\DswG.exe
<Current directory>\jaow.ico
<Current directory>\KQoa.exe
C:\RCX17.tmp
%TEMP%\iYsAYskU.bat
<Current directory>\EOgk.ico
<Current directory>\vUUo.exe
C:\RCX16.tmp
%TEMP%\yccwokEU.bat
C:\RCX10.tmp
%TEMP%\UCEkEcEw.bat
<Current directory>\woAo.ico
<Current directory>\EEUY.exe
<Current directory>\GwoE.exe
C:\RCXF.tmp
<Current directory>\jeAo.ico
<Current directory>\bcYa.exe
C:\RCX12.tmp
<Current directory>\VgMY.ico
<Current directory>\bckI.exe
<Current directory>\goIu.exe
C:\RCX11.tmp
%TEMP%\IqoskUEY.bat
<Current directory>\OYcY.ico
<Current directory>\bsUE.ico
<Current directory>\Iwgu.exe
C:\RCX1D.tmp
C:\RCX1C.tmp
%TEMP%\NEIcgwQc.bat
<Current directory>\gMks.ico
<Current directory>\oUwg.exe
%TEMP%\fsswEwYE.bat
<Current directory>\uSoo.ico
<Current directory>\UsAe.exe
C:\RCX1F.tmp
C:\RCX1E.tmp
<Current directory>\akgE.ico
<Current directory>\fQMc.exe
%TEMP%\giswQYAQ.bat
<Current directory>\uEgO.exe
C:\RCX19.tmp
%TEMP%\raMsUwcs.bat
<Current directory>\CkkQ.ico
<Current directory>\qYws.ico
<Current directory>\CQgs.exe
C:\RCX18.tmp
<Current directory>\GeIA.ico
<Current directory>\ogQm.exe
C:\RCX1B.tmp
%TEMP%\PoMQYkgI.bat
<Current directory>\asck.ico
<Current directory>\ewcq.exe
%TEMP%\EMAQIAIc.bat
C:\RCX1A.tmp
C:\RCX3.tmp
%TEMP%\BGEsAcUM.bat
<Current directory>\UWYU.ico
<Current directory>\wUUy.exe
<Current directory>\XYwG.exe
C:\RCX2.tmp
<Current directory>\QGEs.ico
<Current directory>\eQky.exe
%TEMP%\rkcQQUQA.bat
<Current directory>\eIoc.ico
<Current directory>\kAwG.exe
C:\RCX5.tmp
C:\RCX4.tmp
<Current directory>\haMM.ico
<Current directory>\TIIE.exe
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
<Current directory>\Hkko.ico
%TEMP%\ScYQEIIA.bat
%ALLUSERSPROFILE%\casg.txt
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\<Virus name>
%TEMP%\file.vbs
%TEMP%\lUwMMIAY.bat
%TEMP%\lowIIswg.bat
<Current directory>\UCYc.ico
<Current directory>\GUAo.exe
C:\RCX1.tmp
%TEMP%\wyswwEQs.bat
<Current directory>\iUMc.exe
C:\RCXC.tmp
%TEMP%\EusAYkEQ.bat
<Current directory>\uWQA.ico
<Current directory>\vAYW.exe
C:\RCXB.tmp
%TEMP%\cegYMoso.bat
<Current directory>\XmEo.ico
C:\RCXE.tmp
%TEMP%\PaQIokYo.bat
<Current directory>\pOUg.ico
<Current directory>\JQMU.exe
<Current directory>\TgQQ.exe
C:\RCXD.tmp
<Current directory>\rMEk.ico
<Current directory>\EyIA.ico
<Current directory>\fssO.exe
C:\RCX8.tmp
C:\RCX7.tmp
C:\RCX6.tmp
<Current directory>\fMcs.ico
<Current directory>\UAwe.exe
%TEMP%\uOYgwQIE.bat
<Current directory>\Lwku.exe
C:\RCXA.tmp
<Current directory>\GuQc.ico
<Current directory>\rWQM.ico
<Current directory>\wiMw.ico
<Current directory>\YAoy.exe
C:\RCX9.tmp

Deletes the following files:

<Current directory>\oqYc.ico
<Current directory>\vUUo.exe
<Current directory>\SKsA.ico
<Current directory>\gcMO.exe
<Current directory>\jaow.ico
<Current directory>\EOgk.ico
<Current directory>\CQgs.exe
%TEMP%\yccwokEU.bat
<Current directory>\KQoa.exe
<Current directory>\bcYa.exe
<Current directory>\woAo.ico
<Current directory>\EEUY.exe
<Current directory>\jeAo.ico
<Current directory>\goIu.exe
<Current directory>\VgMY.ico
<Current directory>\DswG.exe
<Current directory>\OYcY.ico
<Current directory>\bckI.exe
%TEMP%\fsswEwYE.bat
<Current directory>\Iwgu.exe
<Current directory>\oUwg.exe
<Current directory>\gMks.ico
<Current directory>\bsUE.ico
<Current directory>\UsAe.exe
<Current directory>\uSoo.ico
<Current directory>\fQMc.exe
<Current directory>\akgE.ico
<Current directory>\CkkQ.ico
%TEMP%\raMsUwcs.bat
<Current directory>\qYws.ico
<Current directory>\uEgO.exe
<Current directory>\ewcq.exe
<Current directory>\ogQm.exe
<Current directory>\asck.ico
<Current directory>\GeIA.ico
%TEMP%\PoMQYkgI.bat
<Current directory>\TIIE.exe
<Current directory>\haMM.ico
<Current directory>\eQky.exe
<Current directory>\UWYU.ico
<Current directory>\kAwG.exe
<Current directory>\fMcs.ico
<Current directory>\fssO.exe
<Current directory>\eIoc.ico
<Current directory>\UAwe.exe
<Current directory>\Hkko.ico
%TEMP%\lUwMMIAY.bat
%TEMP%\ScYQEIIA.bat
<Current directory>\GUAo.exe
<Current directory>\XYwG.exe
<Current directory>\QGEs.ico
%TEMP%\BGEsAcUM.bat
<Current directory>\UCYc.ico
<Current directory>\wUUy.exe
<Current directory>\TgQQ.exe
<Current directory>\XmEo.ico
<Current directory>\uWQA.ico
%TEMP%\EusAYkEQ.bat
<Current directory>\JQMU.exe
<Current directory>\pOUg.ico
%TEMP%\UCEkEcEw.bat
<Current directory>\rMEk.ico
<Current directory>\GwoE.exe
<Current directory>\YAoy.exe
<Current directory>\wiMw.ico
<Current directory>\EyIA.ico
%TEMP%\uOYgwQIE.bat
<Current directory>\Lwku.exe
<Current directory>\GuQc.ico
<Current directory>\iUMc.exe
<Current directory>\rWQM.ico
<Current directory>\vAYW.exe

Moves the following files:

from C:\RCX15.tmp to <Current directory>\gcMO.exe
from C:\RCX16.tmp to <Current directory>\vUUo.exe
from C:\RCX17.tmp to <Current directory>\KQoa.exe
from C:\RCX14.tmp to <Current directory>\DswG.exe
from C:\RCX11.tmp to <Current directory>\bcYa.exe
from C:\RCX12.tmp to <Current directory>\goIu.exe
from C:\RCX13.tmp to <Current directory>\bckI.exe
from C:\RCX18.tmp to <Current directory>\CQgs.exe
from C:\RCX1D.tmp to <Current directory>\Iwgu.exe
from C:\RCX1E.tmp to <Current directory>\fQMc.exe
from C:\RCX1F.tmp to <Current directory>\UsAe.exe
from C:\RCX1C.tmp to <Current directory>\oUwg.exe
from C:\RCX19.tmp to <Current directory>\uEgO.exe
from C:\RCX1A.tmp to <Current directory>\ewcq.exe
from C:\RCX1B.tmp to <Current directory>\ogQm.exe
from C:\RCX10.tmp to <Current directory>\EEUY.exe
from C:\RCX5.tmp to <Current directory>\TIIE.exe
from C:\RCX6.tmp to <Current directory>\kAwG.exe
from C:\RCX7.tmp to <Current directory>\UAwe.exe
from C:\RCX4.tmp to <Current directory>\eQky.exe
from C:\RCX1.tmp to <Current directory>\GUAo.exe
from C:\RCX2.tmp to <Current directory>\XYwG.exe
from C:\RCX3.tmp to <Current directory>\wUUy.exe
from C:\RCX8.tmp to <Current directory>\fssO.exe
from C:\RCXD.tmp to <Current directory>\TgQQ.exe
from C:\RCXE.tmp to <Current directory>\JQMU.exe
from C:\RCXF.tmp to <Current directory>\GwoE.exe
from C:\RCXC.tmp to <Current directory>\iUMc.exe
from C:\RCX9.tmp to <Current directory>\YAoy.exe
from C:\RCXA.tmp to <Current directory>\Lwku.exe
from C:\RCXB.tmp to <Current directory>\vAYW.exe

Network activity:

Connects to:

'74.##5.232.51':80

TCP:

HTTP GET requests:

74.##5.232.51/

UDP:

DNS ASK google.com

Miscellaneous:

Searches for the following windows:

ClassName: '' WindowName: 'AcIcUcAM.exe'
ClassName: 'Shell_TrayWnd' WindowName: ''
ClassName: '' WindowName: 'Microsoft Windows'
ClassName: 'Indicator' WindowName: ''
ClassName: '' WindowName: 'jaQEcQMQ.exe'

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